zad 6.
a) x/5+8=20
x/5+8=20 /*5
x+40 = 200
x = 160
b) 3+ x/3 = 4
3+x/3 = 4 /*3
9 + x = 12
x = 3
zad. 7
a)
3(x-5) = 9
3x-15 = 9
3x = 24 /:3
x = 8
b) 4(x+1) = -8
4x+4 = -8
4x = -12 /:4
x = -3
zad. 8
a) 2x+5+x-2=12
3x=9/:3
x=3
b) -3x-1+5x+7 = 0
2x= -6 /:2
c) 4x+7-x+2 =9
3x = 9-9
3x= 0 /:3
x = 0
zad.9
a) 6x+4=2x
4x= -4/:4
x = -1
b) 3x-4=5x
-2x = 4 /:(-2)
x = -2
c) -2x+7= 6x-9
-8x = -16 /:(-8)
x = 2
d) -2x = 7x+18
-9x = 18 /:(-9)
e) -4x+5 = 25-9x
5x = 20 /:5
x = 4
